Cheap wireless mouse.
Built-in rechargeable cell (14500, 500 mAh nominal), noiseless, wireless. Charged with micro USB cable, small USB radio receiver is included.
Optical sensor: KA8. Poorly documented, but apparently identical to PAW3204DB and even better documented MX8650.
LED is emitting infrared.
BYKC68MS - not a lot info on this, but this seems to be somehow popular in this type of peripherals.
PCB: BYKC_M1-VER1.1
Two main microswitches (left and right) are unusual and almost noiseless.
Currently not working - I see almost no activity except for periodic pulses on one of the crystal legs and maybe something when powering on, otherwise sensor data lines are idle. Swapping crystal and adding 30 pF capacitors to it did not help.
Other mouse with very similar circuit and even similar, quiet mouse button switches, T-WOLF Q13: https://mysku.ru/blog/aliexpress/67695.html.
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